COMA

BASE

OUT

C2

SCLK

C3

SDI

C1

VD

ERRLVL

CSB

VA

COMD

40

HART

Modulator

LDO

4-20 mA

Loop

80k

ÐÂ DAC

16

DAC161S997

LOOP+

LOOP-

ERRB

+

-

SDO

NC

VD

Internal

Reference

DAC161S997

www.ti.com

SNAS621 – JUNE 2013

16-bit SPI Programmable DAC for 4-20mA Loops

Check for Samples: DAC161S997

1

FEATURES

DESCRIPTION

The DAC161S997 is a very low power 16-bit

ΣΔ

2

•

16-bit Resolution

digital-to-analog converter (DAC) for transmitting an

•

Very Low Supply Current of 100 µA

analog output current over an industry standard 4-

•

5 ppmFS/°C Gain Error

20mA current loop. The DAC161S997 has a simple

4-wire SPI for data transfer and configuration of the

•

Pin-Programmable Power-Up Condition

DAC functions. To reduce power and component

•

Loop-Error Detection and Reporting

count in compact loop-powered applications, the

•

Programmable Output-Current Error Levels

DAC161S997 contains an internal ultra-low power

voltage reference and an internal oscillator. The low

•

Simple HART Modulator Interfacing

power consumption of the DAC161S997 results in

•

Highly Integrated Feature Set in Small

additional current being available for the remaining

Footprint WQFN-16 (4 × 4 mm, 0.5 mm Pitch)

portion of the system. The loop drive of the

DAC161S997 interfaces to a Highway Addressable

APPLICATIONS

Remote Transducer (HART) modulator, allowing

injection of FSK modulated digital data into the 4-

•

Two-Wire 4-20mA Current-Loop Transmitter

20mA current loop. This combination of specifications

•

Loop-Power Transmitters

and features makes the DAC161S997 ideal for 2- and

•

Industrial Process Control

4-wire industrial transmitters. The DAC161S997 is

available in a 16-pin 4 mm × 4 mm WQFN package

•

Actuator Control

and

is

specified

over

the

extended

industrial

temperature range of –40°C to +105°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.